Update composer.json

Author: stefanak-michal

composer.json

@@ -13,7 +13,7 @@
         "ext-mbstring": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": ">=7.5.0",
+        "phpunit/phpunit": ">=7.5.0"
     },
     "support": {
         "issues": "https://github.com/neo4j-php/Bolt/issues",